OpenBLAS/kernel/power/dscal.c

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/**************************************************************************************
* 2016/03/25 Werner Saar (wernsaar@googlemail.com)
* 	 BLASTEST 		: OK
* 	 CTEST			: OK
* 	 TEST			: OK
*	 LAPACK-TEST		: OK
**************************************************************************************/

#include "common.h"

#if defined(__VEC__) || defined(__ALTIVEC__)
#if defined(POWER8) || defined(POWER9)
#include "dscal_microk_power8.c"
#elif defined(POWER10)
#include "dscal_microk_power10.c"
#endif
#endif

#if !defined(HAVE_KERNEL_8)

static void dscal_kernel_8 (BLASLONG n, FLOAT *x, FLOAT alpha)
{

        BLASLONG i;

        for( i=0; i<n; i+=8 )
        {
                x[0] *= alpha;
                x[1] *= alpha;
                x[2] *= alpha;
                x[3] *= alpha;
                x[4] *= alpha;
                x[5] *= alpha;
                x[6] *= alpha;
                x[7] *= alpha;
                x+=8;
        }

}

static void dscal_kernel_8_zero (BLASLONG n, FLOAT *x)
{

        BLASLONG i;
	FLOAT alpha=0.0;

        for( i=0; i<n; i+=8 )
        {
                x[0] = alpha;
                x[1] = alpha;
                x[2] = alpha;
                x[3] = alpha;
                x[4] = alpha;
                x[5] = alpha;
                x[6] = alpha;
                x[7] = alpha;
                x+=8;
        }

}


#endif

int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT da, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT *dummy, BLASLONG dummy2)
{
	BLASLONG i=0,j=0;
	if ( n <= 0 || inc_x <=0 )
		return(0);


	if ( inc_x == 1 )
	{

		if ( da == 0.0 )
		{		

#if defined(POWER10)
			if ( n >= 16 )
			{
				BLASLONG align = ((32 - ((uintptr_t)x & (uintptr_t)0x1F)) >> 3) & 0x3;
				for (j = 0; j < align; j++) {
					x[j] = 0.0;
				}
			}
			BLASLONG n1 = (n-j) & -16;
			if ( n1 > 0 )
			{
				dscal_kernel_8_zero(n1, &x[j]);
				j+=n1;
			}
#else
			BLASLONG n1 = n & -16;
			if ( n1 > 0 )
			{
				dscal_kernel_8_zero(n1, x);
				j=n1;
			}
#endif

			while(j < n)
			{

				x[j]=0.0;
				j++;
			}

		}
		else
		{

#if defined(POWER10)
			if ( n >= 16 )
			{
				BLASLONG align = ((32 - ((uintptr_t)x & (uintptr_t)0x1F)) >> 3) & 0x3;
				for (j = 0; j < align; j++) {
					x[j] = da * x[j];
				}
			}
			BLASLONG n1 = (n-j) & -16;
			if ( n1 > 0 )
			{
				dscal_kernel_8(n1, &x[j], da);
				j+=n1;
			}
#else
			BLASLONG n1 = n & -16;
			if ( n1 > 0 )
			{
				dscal_kernel_8(n1, x, da);
				j=n1;
			}
#endif
			while(j < n)
			{

				x[j] = da * x[j] ;
				j++;
			}
		}


	}
	else
	{

		if ( da == 0.0 )
		{		

			while(j < n)
			{

				x[i]=0.0;
				i += inc_x ;
				j++;
			}

		}
		else
		{

			while(j < n)
			{

				x[i] = da * x[i] ;
				i += inc_x ;
				j++;
			}
		}

	}
	return 0;

}